Flavonoids.

 Flavonoids, including more than 4,000 known individual compounds, are polyphenolic substances isolated from various plants. Beside catechins, Japanese green tea also contains other flavonoids, such as kaempherol, quercetin, myricetin and their glycosides derivatives. Flavonoids are found to have halitosis preventing effect, protective effects against lipid peroxidation of membranes, anti-mutagenic function, inhibition of tumor-promoting activity, inhibition of lipoxygenase and phospholipase, inhibition of histamine release, antihypertensive effects, antifungal, antiviral, antioxidative, hypocholesterolemic and diuretic functions. Therefore it appears that flavonoids can contribute significantly to the benefit of human health

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